The catalytic converter is designed to reduce the
hydrocarbon (HC) emissions that resulted from
incomplete combustion.  the converter might not be
working because its not up to temperature, low O2, or
age.  you might notice that hc levels decrease with
increasing idle speed.

--- Rick Berman <love2bike@uswest.net> wrote:
> Has anyone had a problem with the Cat. unit causing
> the HC to go high on idle. We have a 500+ PPM on HC
> at idle all the gases look great. We have done the
> usually thing and still can not get the HC down.
> \Any help
>
> rick
>

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